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You can use the SELECT clause to modify the message: https://docs.aws.amazon.com/iot/latest/developerguide/iot-sql-select.html
In this case, you probably want to use the topic() function: https://docs.aws.amazon.com/iot/latest/developerguide/iot-sql-functions.html
Something like: SELECT *, topic(3) as thing FROM $aws/things/+/shadow/update
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This worked great, thanks.